1FETESTEXCEPT(P)            POSIX Programmer's Manual           FETESTEXCEPT(P)
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NAME

6       fetestexcept - test floating-point exception flags
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SYNOPSIS

9       #include <fenv.h>
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11       int fetestexcept(int excepts);
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DESCRIPTION

15       The fetestexcept() function shall determine which of a specified subset
16       of the floating-point exception flags are currently  set.  The  excepts
17       argument specifies the floating-point status flags to be queried.
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RETURN VALUE

20       The  fetestexcept()  function  shall  return  the value of the bitwise-
21       inclusive OR of the floating-point exception  macros  corresponding  to
22       the currently set floating-point exceptions included in excepts.
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ERRORS

25       No errors are defined.
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27       The following sections are informative.
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EXAMPLES

30       The  following  example  calls  function f() if an invalid exception is
31       set, and then function g() if an overflow exception is set:
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34              #include <fenv.h>
35              /* ... */
36              {
37                  #pragma STDC FENV_ACCESS ON
38                  int set_excepts;
39                  feclearexcept(FE_INVALID | FE_OVERFLOW);
40                  // maybe raise exceptions
41                  set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
42                  if (set_excepts & FE_INVALID) f();
43                  if (set_excepts & FE_OVERFLOW) g();
44                  /* ... */
45              }
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APPLICATION USAGE

48       None.
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RATIONALE

51       None.
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

57       feclearexcept() , fegetexceptflag() , feraiseexcept() , the Base  Defi‐
58       nitions volume of IEEE Std 1003.1-2001, <fenv.h>
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61       Portions  of  this text are reprinted and reproduced in electronic form
62       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
63       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
64       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
65       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
66       event of any discrepancy between this version and the original IEEE and
67       The  Open Group Standard, the original IEEE and The Open Group Standard
68       is the referee document. The original Standard can be  obtained  online
69       at http://www.opengroup.org/unix/online.html .
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73IEEE/The Open Group                  2003                      FETESTEXCEPT(P)
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